From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lj1-x229.google.com (mail-lj1-x229.google.com [IPv6:2a00:1450:4864:20::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 03A933CB35 for ; Wed, 22 Aug 2018 02:17:49 -0400 (EDT) Received: by mail-lj1-x229.google.com with SMTP id u7-v6so584475lji.3 for ; Tue, 21 Aug 2018 23:17:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=DoqGS2+gcTklMp2iHpl5mX1OfKRWxOlyXcPNaNDhZlA=; b=H394IaltLqnDhaZHI4FW83rewijwgW4pwF8dzreub7kJ2WhmiR420VNualggcSKmGk sERTfSGCSQ/BY+wTitl6DEX9hk8HA90Xu0LS+U4VY2sD/l5sYtHNCWFPWfqxoKB7wEv9 OPA62lMj1NXrwf/vtHqnfcZw3m5dUB6wQZgbzARpLuutDggK6nXBD/yos8+fnJ5c3BB4 HFzqUX0Rs4OeISp4rvWUnwbhhTvtjyRmEdBRJnf9ePe20uXaJN9O66AUNzcmzJ5MRlvL lx/h0n11szrF+t1ICq7xBNC/8SM7tLUSALCf5uXSteQRM5cA9RxPopqV0QZ0E82uxZpG FtpA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=DoqGS2+gcTklMp2iHpl5mX1OfKRWxOlyXcPNaNDhZlA=; b=tiZsK5b5HLQW0F4LpFqJiygZd+4531hl2yJ8en0U0N4rZmlv9UiL8Rujs1BqyYQL18 NU4U1RupdsPKXAoWzisTCJki7nGfw2oQ3J2UBqjRg8exh3kq586flEgVMH2O4wXiPsBe 0BKSN/j1RhtOYct2s3xSSlAUs0+sC1xX9nphTvYK5U505E187iJaayBw6K+yBpOSdxPY RA2gF5g/qe+NnI6AHUcvPVgbbyoJHjBIb17+V9NVBjOo3y+xKK5JNsZ4XruYv2r+CmWa 8Nfk72Xdt8l/i5D8LYr3iWSt/KCBviy0uZ81IAUh1ONSe3eiMhuVAKpyuSVQ5EWIxQJ4 rpqg== X-Gm-Message-State: AOUpUlEOVxqJgi2JwMSEae4YVl1Ngd8yz5TSYG8xBUZtevrL9gZpeQMJ MYJB4SLPvnrP8qO7tWTz1beCvrxF X-Google-Smtp-Source: AA+uWPzQZfOVAKBQ4M+VjAn7D9gwPOSzezGQKpKsW6HajBFzdedFK5QkNamdonTAmi1Tm8RCaYJpIw== X-Received: by 2002:a2e:4357:: with SMTP id q84-v6mr19269844lja.13.1534918668854; Tue, 21 Aug 2018 23:17:48 -0700 (PDT) Received: from jonathartonsmbp.lan (83-245-236-56-nat-p.elisa-mobile.fi. [83.245.236.56]) by smtp.gmail.com with ESMTPSA id 101-v6sm147880lfs.44.2018.08.21.23.17.47 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 21 Aug 2018 23:17:48 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) From: Jonathan Morton In-Reply-To: Date: Wed, 22 Aug 2018 09:17:42 +0300 Cc: =?utf-8?Q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , Cake List Content-Transfer-Encoding: quoted-printable Message-Id: References: <87h8jze5hk.fsf@toke.dk> <85C60B2F-78D0-4AEE-871C-BB637785BF62@gmail.com> <4D28C453-5378-4A5B-9E05-874F36C4DB30@gmail.com> <878t5aedj5.fsf@toke.dk> <87d0uc9d2f.fsf@toke.dk> To: Pete Heist X-Mailer: Apple Mail (2.3445.9.1) Subject: Re: [Cake] issue with Cake and bpf filter X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Aug 2018 06:17:50 -0000 > On 22 Aug, 2018, at 12:06 am, Pete Heist wrote: >=20 > when fq_codel is the qdisc, the eBPF action is only called "once in a = while=E2=80=9D One difference between fq_codel and Cake is that the former - which has = no shaper - will "bypass" packets when it's empty and there's no = back-pressure filling it. In that case no packet classification occurs = and filters will not be called. Or at least, that's how it used to be = set up; I haven't looked at it recently. Cake does not rely on the same = set of assumptions, so will always call the filter. - Jonathan Morton